Chusetts



A. D. ABBENZELLER.

SICKLE BAR..

APPLICATION FILED NOV. 2 4. 1917' Patented Oct. 21, 1919.

112171641X???) flLf PedD.HbTaenze1Ze 1 0 w vvu (77'l'iey- UNITED STATESPATENT o o ALFRED n. ABBENZELLER, on RANDOLPH, MASSACHUSETTS, ASSIGNQRTO unrvnnsnn SICKLE BAR COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATIQNor MASSAa oHUsETTS.

. SICKLE-BARl Application filed November 24, 1917. semi No. 203,713; 5

To all whom it mayccmcern Be it known that I, ALFRED D. ABBENZEL- LER, acitizen of the United States, and a" specification, Figure 1 is asectional top view of a portion of a sickle bar showing blades lockedtherein. Fig. 2 is a face view of one of the cutter blades. Fig. 3 is aperspective View of a part of the bar, a portion thereof being shown asbroken away. Fig. 1 is a cross section of the sickle bar. Fig. 5 is aface view of one of the locking blocks.

The cutter blades 1 are each formed with a dovetail shank 2, and thesickle bar 3 is formed with transverse slots 1 through it for thereception of the shanks, the latter being narrower than the slots, and alocking block 5 beingprovided for driving into the space in each slotnot filled by a shank.

For more firmly fastening the blades in place, I prefer to sink the base6 of each blade quite deeply into the bar 3, as shown in Figs. 1 and 4,and to render the grip of the locking block more secure, to recess thebase of the blade at 7, thereby enabling the locking blocks to besubstantially longer, and by thus having an elongated gripping surface,to increase the hold.

By thus sinking the blades farther into the bar, and the locking block 5farther into each blade, I secure greater security and firmness for eachblock and blade.

To further add to the certainty of the locking blocks remaining firmlyin place, I increase the outer edge of each, making the sameapproximately in the shape of a capital letter L. To widen the main bodyof the block to an equal extent would serve to weaken either the shank 2or the base 7 adjacent the block, but by widening the outer edge aloneof each block I accomplish the desired objects without said weakening ofparts.

Another, and even more important function of the elongation .9-, 'is to;insure against the possibility of any delay or imperfection in fit dueto the introduction of a block wrong way around. As soon as a block istaken into the fingers of the workman, he knows instantly its properposition.

For removably locking the blocks 5 in place, I prefer to form eachthereof with a hole or recess 10 adapted to be engaged by a slightprojection 11 from the thin upper wall 12 of the bar 3, as shown in Fig.4.

The locln'ng blocks are forcibly removed from their positions, when theblades are desired to be taken out, by means of a suitable tool disposedfor engagement with a hole 15 in each block.

In putting the sickle bar together, each blade 1 has its shank 2introduced through a slot 4:, and a locking block 5 forced into thespace .beside the right-hand edge of the shank (as viewed in Fig.1)-until its recess 10 is engaged by the projection 11.

As shown in Fig. 1, the rear edge of the shanks 2, the outer edges ofthe locking blocks 5 and an extension 13 of each un- Patented 'Oct.21,1919;

slotted portion 14 of the bar 3, are all made in approximate alinement.

What I claim is:

1. A sickle bar comprising a bar having numerous transverse slotsthrough it, blades each having a dove-tail shank entering one of saidslots, each shank being narrower than its associated slot and each bladehaving a recess therein at one edge of its shank for prolonging saidedge, a locking block for each blade filling the space between said edgeand the neighboring end of the slot containing the same for locking theshank and blade in firm union with the bar, and means for retaining saidblocks in place, the blocks entering said recesses.

2. A sickle bar comprising a bar having numerous transverse slotsthrough it. blades each having a dove-tail shanklocated in one of saidslots, each shank being narrower than its associated slot and each bladehaving a recess therein at one edge of its shank edge and theneighboring end of the slot containing the same for locking the shankand blade in firm union with the bar. and

means for retaining said locking blocks in place, each of the latterbeing L-shaped and extended behind the bar, and. the bar being 9recessed to receive the leg of each locking block. 1

'3, A sickle bar comprising a bar having numerous slots transverselydisposed therein, blades having each a dovetail shank entering one ofsaid slots, and a locking block between each shank and the neighboringend of the slot containing it for locking the shank and blade in firmunion with the bar, the

locking block having a round hole therein 10 invention, I have hereuntoset my hand this 15 15th day of November, 1917.

ALFRED D. ABBENZELLER.

copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0. r V

